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Finding the Fourth Proportional to 139.41, 192.38 and 81.19

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Solution

The fourth proportional to 139.41, 192.38 and 81.19 is: 112.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.41 : 192.38 = 81.19 : x
  2. Step 2: Convert to fraction form
    139.41/192.38 = 81.19/x
  3. Step 3: Cross multiply
    139.41x = 192.38 × 81.19
  4. Step 4: Simplify right side
    139.41x = 15,619.33
  5. Step 5: Solve for x
    x = 15,619.33/139.41
  6. Step 6: Final answer
    x = 112.04

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.